1)                                                                                             

2)                                                                            

3)                                sempre verificata; cioè

4)                                    

5)                                       impossibile, cioè nessuna soluzione

6)                                                                       []

7)                                  nessuna soluzione                   

8)            3)                           []

9)                                                      []

10)                                   []

11)                                         []

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